Remote Distribution Load Testing in JMeter

Following are the troubleshooting steps to implement remote distribution load testing in JMeter.

Same version of JMeter in master and worker
Same version of Java in master and worker
Master should be able to ping worker, vice-versa
Master and Worker machines must be on the same sub-network. Here is the calculator to check.
Firewall should be disabled
Anti-virus might need to be turned off
Delete the unnessary network interfaces in Windows to avoid the network related issues
By default, JMeter uses SSL in RMI.
SSL for RMI certificate has the validity of 7 days by default, make sure you generate the certificate once in 7 days. The number of days can be changed in the create-rmi-keystore file: keytool -genkey -keyalg RSA -alias rmi -keystore rmi_keystore.jks -storepass changeit -validity 7 -keysize 2048 %*
Place the generated certificate in all the worker nodes
If the test plan uses, plugins, make sure it is available in the worker nodes.
Troubleshoot the remote testing by disable SSL in jmeter.properties

Windows Troubleshooting

Make sure you enabled only below connections in your network.

Commands

jmeter.properties in Master

remote_hosts=<WorkerIP>
server.rmi.ssl.disable=true
server.rmi.localport=4000

Starting Worker Machine

./jmeter-server -Djava.rmi.server.hostname=<Worker_IP>

Sample Output

Using local port: 4000
Created remote object: UnicastServerRef2 [liveRef: [endpoint:[192.168.0.99:4000](local),objID:[59f63471:179a76f79c7:-7fff, -5372372549273377610]]]

Starting Tests Master Machine

jmeter.properties/user.properties in Worker

server.rmi.ssl.disable=true
server.rmi.localport=4000

cd into JMeter folder

./jmeter.sh -Djava.rmi.server.hostname=<Master_IP> -n -t examples/CSVSample.jmx -l Run1.log -R<Worker_IP>

Sample Output in Master

Creating summariser <summary>
Created the tree successfully using examples/CSVSample.jmx
Configuring remote engine: 192.168.0.99
Using local port: 4000
Starting distributed test with remote engines: [192.168.0.99] @ Wed May 26 02:50:45 EDT 2021 (1622011845669)
Remote engines have been started:[192.168.0.99]
Waiting for possible Shutdown/StopTestNow/HeapDump/ThreadDump message on port 4445
summary =     12 in 00:00:04 =    3.3/s Avg:   234 Min:   123 Max:   326 Err:     0 (0.00%)
Tidying up remote @ Wed May 26 02:50:51 EDT 2021 (1622011851137)

Sample Output in Worker

Starting the test on host 192.168.0.99 @ Wed May 26 02:50:47 EDT 2021 (1622011847465)
Finished the test on host 192.168.0.99 @ Wed May 26 02:50:51 EDT 2021 (1622011851480)

Disabling Firewall in CentOS

To check the status:

sudo firewall-cmd --state

To stop the firewall:

sudo systemctl stop firewalld

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